Abstract
The crystalline solids found in nature are neither pure nor perfect but contain some degree of imperfection. This chapter begins with a brief account of various types of imperfections in crystalline solids: point defects and dislocations. The various types of point defects and their statistical distribution on the lattice are discussed, taking account of the entropy of mixing. The different types of dislocations observed in crystalline solids are presented in this chapter. The burgers vector, which gives the magnitude and direction of the slip, is discussed in detail as regards the various types of dislocations. The expressions for the shear stress and shear strain acting on a dislocation, the density of dislocations, and the dislocation energy have been derived for simple structures. The chapter concludes with the Frank-Read source method for the growth of dislocations.
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